參數(shù)資料
型號: MC68HC05L25PB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
封裝: TQFP-52
文件頁數(shù): 17/152頁
文件大小: 897K
代理商: MC68HC05L25PB
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
113
Chapter 12
Analog Subsystem
12.1 Introduction
The MC68HC05L25 includes a 2-channel, multiplexed input, 8-bit, successive approximation
analog-to-digital (A/D) converter. The A/D subsystem shares its inputs with port A pins PA4 and PA5.
12.2 Analog Section
The following paragraphs describe the operation and performance of analog modules within the analog
subsystem.
12.3 Ratiometric Conversion
The A/D converter is ratiometric, with pin VREFH = VDD supplying the high reference voltage. Applying an
input voltage equal to VREFH produces a conversion result of $FF (full scale). Applying an input voltage
equal to VSS produces a conversion result of $00. An input voltage greater than VREFH will convert to $FF
with no overflow indication. For ratiometric conversions, VREFH should be at the same potential as the
supply voltage being used by the analog signal being measured and should be referenced to VSS.
12.3.1 VREFH
The reference supply for the A/D converter is tied to VDD internally. The low reference is tied to the VSS
pin internally.
12.3.2 Accuracy and Precision
The 8-bit conversion result is accurate to within
±1.5 LSB, including quantization; however, the accuracy
of conversions is tested and guaranteed only with external oscillator operation at VDD = 5 V.
12.4 Conversion Process
The A/D reference inputs are applied to a precision digital-to-analog (D/A) converter. Control logic drives
the D/A and the analog output is successively compared to the selected analog input which was sampled
at the beginning of the conversion cycle. The conversion process is monotonic and has no missing codes.
12.5 Digital Section
The following paragraphs describe the operation and performance of digital modules within the analog
subsystem.
相關(guān)PDF資料
PDF描述
MC68HC05LJ5P 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP16
MC68HC05M4CFN 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC52
MC68HC05M4MFN 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC52
MC68HC05P1ADWR2 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HSC05P1ADWR2 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC05L28 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
MC68HC05L28B 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Flexible general-purpose microcomputer
MC68HC05L2B 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
MC68HC05L2CB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
MC68HC05L6 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcomputer with Liquid Crystal Driver Circuitry